An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 200
hen a current passes through the fine wireC, the wire is heated, causing it to expand slightly. As thespring pulls it down through the second wire, the roller turns andmoves a pointer over a scale. The scale must be calibratedby finding experimentally the points to which the pointer turnswhen 1… … Fig. 106. — Hot-wire ammeter. 172 ELECTRICITY AND MAGNETISM One of the oldest forms of ammeters is the two-coil type,which is usually called an electrodynamometer. Figure 107shows the ordinary form of the Siemens electrodynamometerwhen arranged for use as an ammeter. One coil F in this instrument…
Electricity · Magnetism
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